Electrical rotary actuators with rated torque of 100 Nm. 16000 Nm for the operation of final control elements with preferably 90° rotary movement such as flaps, cocks, dampers, etc. A lever / linkage bar assembly transfers the torque or the actuator is directly coupled to the cock flange. Electrical rotary actuators of the RHDE… series are designed for the use in hazardous areas. They are controlled via standard electronic units, loaded with specific data for the explosion-proof actuators. These electronic units for field or rack installation are installed in the non-hazardous area.